SU1450052A1 - Single- to three-phase voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in control systems of synchronized inverters. The purpose of the invention is to enhance the functionality and simplify. The converter contains an adjustable auto-oscillator 1 and phase shifting devices 2, 3, which ensure the conversion of the number of phases, as well as a control system. And stabilization, including limiting amplifiers 7, 8, 16, 17, logic circuitry AND 11, 18, 19, trigger t2, integrator 13, voltage sensor 5, clock source 4, (/) sl Q1 Is9 (ti.i

Description

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 6, connected in a certain way. Introduction of limiting amplifiers 16, 17, inputs of connected k output phases B and C, and outputs respectively to the inputs of circuits And 18, 19, as well as execution of circuits And 18, 19 according to diode circuits And with three inputs And their connection through diodes 20 , 21 p resistors 14, 15 to the control

the input of the integrator 13 provide a linear measurement of the phase shift to 60 PLN. hail. As a result, the speed increases with the preservation of the stable operation of the phase adjustment system with sharp changes in the clock frequency and a wide range of possible network frequency drift in emergency modes. 2 Il.

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The invention relates to electrical equipment, in particular, to valve converters, and can be used in the construction of control systems for synchronized inverters: uninterruptible power units running into the composition of uninterrupted power supply units.

The purpose of the invention is to expand the functionality and support of 1 (device 5. I. Fig. 1 shows a diagram of the converter; Fig. 2 shows temporary diagrams of its operation (head numbers correspond to the digital designation by ele ij eHTOB in Fig. 1) The device contains a single-phase adjustable auto-oscillator of 1 sinus voltage connected in accordance with the phase-shifting DFT of fuses 2 and 3, the source 4 of the synchro- | ignal connected with the logical yes / bic 5 voltage and through the closing | contact of the relay 6 - with the input synchronization of the oscillator 1, amplify and limiters 7 and 8, input I connected respectively to the outputs of the source 4 clock signal and the output of the oscillator 1, and the outputs through the drivers 9 and 10 narrow pulses - (with circuit inputs I. 11-trigger 12, the first 6YY output is connected to the output And 11, the second input - with the output of the logic sensor 5 voltage, and the output is connected to the relay 6, the integrator 13, the logical output of which is connected to the output of the trigger 12, the control input - with resistors 14 and 15, and the output is connected to the control the input of the oscillator 1, the amplifiers-limiters 16 and 17, the outputs to toryh respectively connected to the outputs F

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displacement devices 2 and 3, three-pole diode circuits with different polarity And 18 "19, the first inputs of which are connected to the output of the amplifier are limited. bodies 7, the second inputs -: to the output of the amplifier-limiter 8, the third inputs, respectively - to the outputs of the limiting amplifiers 16 and 17, and the output of the circuit 18 through the anode of the diode 20 to the resistor 14, output And 19 through the diodes 21 to resistor 15.

The device works as follows.

In the absence of eg Keny at the source 4 of the sync signal, the contact of the relay 6 is open and the integrator 13 outputs a constant voltage at the output that determines the natural frequency of the generator 1 in the autonomous mode. The autogenerator 1 and the phase shifting device 2 and 3 form a symmetrical three-phase voltage system when a voltage appears at the output of the source 4 of the sync signal. The logic device formed by the amplifier by limiters 7 and 8, the formers 9 and 10 narrow pulses, circuit 11, trigger 12, sensor-5, at the time of the coincidence of the narrow pulses formed when the voltage source 1 of the sync signal crosses zero, sends, through the contact of relay 6, the synchronizer to the voltage 1 to the input of the autogenerator 1 and translates the integrator 13 into the integrated circuit. In this case, the self-oscillator 1 enters the mode, the frequency locking and operates synchronously at the frequency of the source 4 of the sync signal. If the natural frequency of the generator 1 and the source 4 of the sync signal are equal to each other, then

phase shift between synchronized voltages is missing. When the frequencies are not equal, a phase shift appears between the voltages of the oscillator 1 and the clock source 4, and at the output of the phase error sensor formed by the amplifiers 7, 8, 16 and 17 and two polarized diode circuits And 18 and 19 , rectangular pulses appear, the duration and polarity of which are determined by the magnitude and sign of the phase error (Fig. 2). Pulses from the circuits And 18 And 19 through: resistors-14 and 15 and diodes 20 and 21 are fed to the input of the integrator 13, which converts a pulse signal into a potential one. The signal from the integrator 13 acts on. the control input of the auto-oscillator 1 and change its frequency until the phase shift is zero, while the natural frequency of the oscillator 1 becomes equal to the frequency of the source 4 clock signal.

The introduction of additional limiting amplifiers 16 and 17, the inputs connected to phases B and C and, respectively, to the inputs of the circuits H 18 and 19, provides a linear measurement of the phase shift up to 60 electrical degrees (FIG. 2) and The most efficient performance of the proposed converter while maintaining the stable operation of the phase control system with sudden changes in the clock frequency up to the limit of the capture range compared to the known one, in which the linear measurement of the phase shift is determined by the duration of the pulses There are only a few ah.hours from the formers 9 and to.

Claims (1)

Formula inventions I 5 ten Single-phase voltage to three-phase voltage converter containing single-phase sinuso oscillator connected in series an ideal voltage and two phase shifters, the common connection points of which and the free output of the last phase-shifting device form the output phase outputs A, B, C, of the clock source, the output of which is connected to the input of the logic voltage sensor and through the short-circuit relay contact - with the input synchronization sync of the autogenerator, the first and second amplifiers-limiters, the inputs of which are connected respectively to the output of the clock source and 15 phase pins A, and the outputs through the corresponding shapers of narrow impulses All are with the corresponding inputs of the first logic circuit And, the output of which is connected to the first input 20 of the trigger, the second input of which is connected to the output of the logic voltage sensor, and the output is connected to the relay and to the logic input of the integrator, the output connected to the control input 25 of the autogenerator, two diodes, the first of which is cathode through the first resistor, and the second anode through the second resistor are connected to the integrator control fy input, as well as the second and third logic circuits AND, characterized in that capabilities and simplification, the third and fourth limiting amplifiers are additionally introduced, and the second and third circuits AND are made on diode circuits I, which are different in relation to each other, to three inputs, and the inputs of the third and fourth amplifiers are connected to the phase Viewers B and C, and the outputs respectively to the third inputs of the second and third circuits I, the first inputs of which are connected to the output and house of the first amplifier limiter, their second inputs to the output of the second amplifier limiter, the output of the second circuit And connected to the anode of the first moRa, and the output of the third AND gate is connected to the cathode of the second diode. thirty 35 1450052 I 5 15 20 25 d Rig.2